From Emacs

Bring up an Objective C file using Files/Open. Say /src/swarmapps-2.1.1/heatbugs/main.m.

Select Tools/Compile and hit return

Run heatbugs in the debugger by going to Tools/Debugger, and then type heatbugs after gdb in the minibuffer

Type the word run

Control left-mouse can be used to switch between buffers and Files/Kill Current Buffer can be used to kill them, including the buffer that manages gdb or compilation data

Bring up a Java file using Files/Open. Say /src/jheatbugs-2.1.1/StartHeatbugs.java

Select JDE/Compile

Select JDE/Run App